Process of making toothed cylinders.



E. J. OBRIEN.

PROCESS OF MAKING TOOTHED CYLINDERS.

- APPLICATION FILED MAY 10, 1907.

Patented May 10, 1910.

2 SHEETS-SHEET 1.

E. J. OBRIEN.

PROCESS 01 MAKING TOOTHED GYLINDBRS.

APPLICATION III IED MAY 10, 1907.

2 SHEETS-SHEET 2.

Patented May 10, 1910.

UNETED STATES PATENT @FFKQE EDWARD J. OBRIEN, OF ST. LOUIS, MISSOURI,ASSIGNOR To THE PROCTOR AND GAMBLE COMPANY, A CORPORATION OF OHIO.

PROCESS OF MAKING TOOTI-IED CYLINDERS.

Original application filed November 18, 1905, Serial No. 287,950.

Serial No. 372,874.

To all whom it may concern:

Be it known that I, EDWARD J. OBnmu, a citizen of the United States ofAmerica, and a resident of St. Louis, in the State of Missouri, haveinvented certain new and useful Improvements in Processes of MakingToot-lied Cylinders, of which the following is a specification.

This invention relates to a process of producin and reproducing teethupon metal cylinders used in cotton seed delinting machines and thelike, and has for its object to provide a simple and eflicient processwhereby a multiplicity of fine teeth in close relation are formed in aready and efficient manner in the periphery of a metal cylinder or vroll in which a series of circularly or spirally arranged ridges of asubstantially triangular form had been initially formed, and by means ofwhich a dense and enduring nature is imparted to the points of theteeth. And with which the original form of the teeth, when worn bycontinued use, can be readily and efficiently restored without theremoval of any of the metal of said teeth or cylinder, all as willhereinafter more fully appear.

The accompanying drawings illustrate an apparatus for effecting thepresent improved process. Such apparatus forms the subiect matter of myprior Letters Patent- No. 855,658, dated June 4:, 1907, and of which thepresent application is a division. In such drawings :-Figure 1, is atransverse sectional elevation on line mm, Fig. 2. Fig. 2, is alongitudinal sectional elevation on line m0a Fig. 1. Fig. 3, is a detailelevation of the central member of the carria e which carries thenurling rolls. Fig. 4C is a detail elevation of one of the cam rings ofsaid carriage. Fig. 5 is an enlarged detail side elevation of one of themilling or nurling rolls of said carriage. Fig. 6, is a similar view ofthe other or companion milling or nurling roll.

Similar numerals of reference indicate like parts in the several views.

Referring to the drawings, 1 represents the stationary supporting framepreferably consisting of a pair of end standards connected together bylongitudinal bars or rods 2, which constitutes the slideway for thecarriage of the milling or nurling rolls hereinafter described.

Specification of Letters Patent.

Patented May it), 1910.

Divided and this application filed May 10,

3 are alined journal boxes carried by said standards, to afford bearingsfor either the usual carrying shaft l, of the metal cylinder to bemilled or knurled; or for the end arbors of an ordinary holding mandrelwhen the metal cylinder is in the form of a cylindrical shell andcarried during the process on such holding mandrel. And in either casethe shaft or mandrel will receive posi tive rotation from a suitablepower source in any usual manner.

5 is the metal cylinder or shell, which prior to its treatment by thepresent process. has its periphery formed with a series ofcircumferential teeth of a slightly less depth than the intended depthof the teeth when finished. And it is preferable that said initialcircumferential threads have a spiral arrangement, in that the sameaffords means for automatically imparting longitudinal movement to thehereinafter described series of milling or nurling rolls in the progressof the present process.

6 is the central carrying member of the carriage heretofore referred to.Such member consists of a series of segmental plates connected togetheras hereinafter described, and has sliding engagement with the guide rodsor bars 2 of the stationary supporting frame by guide sleeves T on thelowermost segments of said central member.

8 are a pair of clamping rings arranged at opposite sides of and boltedto the segments aforesaid to maintain the same in separated relation asshown in Fig. 3 and provide radial ways for the guide shanks of thehereinafter described carrying yokes of the milling or nurling rolls.

9 are peripheral flanges on the rings 8 to form similar bearing recessesat the periphery of said rings and at opposite sides of the centralmember 6, as shown in Fig. 2, for the reception of the hereinafterdescribed cam rings by which simultaneous radial adjustment is impartedto the milling or nurling rolls and their carrying yokes.

10 are the carrying yokes above referred to, and which are provided withguide shanks 11 having sliding movement in the before described radialways located between the segmental plates of the member 6 and the rings8. Such shanks are provided with lateral studs or pins 12 at or neartheir outer ends for engagement in the eccentric or cam slots of theoperating cam rings hereinafter described.

13 are the cam rings, of a plate form and arranged in the respectiveperipheral recesses of the rings 8 and having a turning adjustmentthereon.

1% are plurality of eccentric slots formed in the cam rings and soarranged that the slots in one ring will be in crossed or reversedrelation to the slots in the other ring as shown in Fig. 1; such slots14 receive the lateral pins 12 of the carrying yokes 1O aforesaid toconstitute operative connections between the cam rings and the series ofcarrying yokes, and so that simultaneous radial adjustment will beimparted to the car rying yokes with a circular adjustment of the camrings.

15 is a shaft having right and left-hand screw threads on its respectiveends adapted for operative engagement with screwthreaded hubs mountedupon the arms 17 of the respective cam rings 1-3.

18 and 19 are the milling or nurling rolls, usually four in number. Oneset or pair 18 of said rolls are grooved circumferentially to form aseries of V-shaped circular ridges as shown in Fig. 5; while the otherset or pair of said rolls are grooved longitudinally to form a series oflongitudinal ridges of a substantially triangular form as shown in Fig.6.

The mode of operation of the present process is as follows :The carriagecarrying the series of milling or nurling rolls is moved to one end ofthe apparatus and said rolls moved radially outward. The" metal cylinderafter having been first operated upon in a turning lathe or the like, toproduce in its periphery a spiral thread of a slightly less depth thanthe intended depth of the finished teeth, is journaled in the supporting frame and receives a positive rotation from a suitable powersource. The milling or nurling rolls are then forced inwardly intoengagement with the threaded periphery of the metal cylinder by themanual means heretofore described. As the metal cylinder revolves thecircularly ridged periphery of the rolls 18 will follow the threadinitially chased in the periphery of said metal cylinder; while thelongitudinally ridged periphery of the rolls 19 will force the metalunder the edges of their ridges toward the center of the cylinder 5,thereby bringing out pyramidal points of uniform length and with equalpitch on each side and at an angle of ninety degrees and forty-fivedegrees approximately front and back.

By the above described process of producing and reproducing a series ofteeth in the periphery of a metal cylinder or roll, a very dense,strong, tough and efficient abrasive surface is produced, with the addedadvantage, that when after continued use the teeth become worn anddulled on the points, the present process can be repeated to bring upthe teeth again without removing any of the metal of the cylinder andaccordingly the present process affords a very superior, accurate andexpeditious manner of renewing the abrasive surfaces of a toothedcylinder when dulled and worn, and at the same time imparting densityand durability to the points of the teeth.

Having thus fully described my said invention, what I claim as new anddesire to secure by Letters Patent, is:

1. The herein described process of forming toothed cylinders, the sameconsisting in initially forming a series of circular threads upon theperiphery of a metal cylinder, and subsequently forming a series oflongitudinal grooves in said threads and simultaneously imparting addeddensity to the teeth thus formed by a lateral displacement of the metalthereof.

2. The herein described process of forming toothed cylinder-s, the sameconsisting in initially forming a series of spiral threads upon theperiphery of a metal cylinder, and subsequently forming a series oflongitudinal grooves in said threads and simultaneously imparting addeddensity to the teeth 7 thus formed by a lateral displacement of themetal thereof.

Signed at St. Louis Missouri, this 7th day of May 1907.

.EDWARD J. OZBRIEN. Witnesses:

ROBERT BURN-s, JAs. E. GREEN.

